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Shareholders' Equity - Summary of Table Reconciling Basic and Diluted Net Income Per Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Basic Net Income Per Share                      
Net income $ 74,120 $ 77,944 $ 51,705 $ 22,640 $ 49,185 $ 69,781 $ 62,964 $ 56,276 $ 226,409 $ 238,206 $ 190,830
Weighted average common shares outstanding (in shares) 164,799 164,773 164,732 167,748 169,235 170,746 172,985 174,734 165,509 171,907 155,675
Effect of dilutive securities:                      
Restricted stock (in shares)                 632 733 796
Stock options (in shares)                 36 47 68
Basic Net Income Per Share (in dollars per share) $ 0.45 $ 0.47 $ 0.32 $ 0.13 $ 0.29 $ 0.41 $ 0.37 $ 0.32 $ 1.37 $ 1.39 $ 1.23
Diluted Net Income Per Share                      
Net income $ 74,120 $ 77,944 $ 51,705 $ 22,640 $ 49,185 $ 69,781 $ 62,964 $ 56,276 $ 226,409 $ 238,206 $ 190,830
Weighted average common shares outstanding (in shares) 164,799 164,773 164,732 167,748 169,235 170,746 172,985 174,734 165,509 171,907 155,675
Weighted average shares outstanding (in shares) 165,631 165,419 165,302 168,404 170,186 171,551 173,675 175,368 166,177 172,687 156,539
Diluted Net Income Per Share (in dollars per share) $ 0.44 $ 0.47 $ 0.32 $ 0.13 $ 0.29 $ 0.41 $ 0.36 $ 0.32 $ 1.36 $ 1.38 $ 1.22